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ISSUE 02: 26-Sep-2023 Page 1 002514MAN-03
Maritime Geothermal Ltd.
P.O. Box 2555, 170 Plantation Road
Petitcodiac, NB E4Z 6H4
(506) 756-8135
RS-Series
Liquid to Air Split
Geothermal Heat
Pump
Two-Stage R410a
Model Sizes 45-80
www.nordicghp.com
002514MAN-03
ISSUE 02: 26-Sep-2023
Application, Installation, & Service Manual
ISSUE 02: 26-Sep-2023 Page 2 002514MAN-03
WARNING: Ensure all access panels are in place and properly secured before applying power to the unit.
Failure to do so may cause electrical shock.
WARNING: Before performing service or maintenance on the heat pump system, ensure all power sources
are DISCONNECTED. Electrical shock can cause serious personal injury or death.
WARNING: Heat pump systems contain refrigerant under high pressure and as such can be hazardous to
work on. Only qualified service personnel should install, repair, or service the heat pump.
CAUTION: Safety glasses and work gloves should be worn at all times whenever a heat pump is serviced.
A fire extinguisher and proper ventilation should be present whenever brazing is performed.
CAUTION: Venting refrigerant to atmosphere is illegal. A proper refrigerant recovery system must be
employed whenever repairs require removal of refrigerant from the heat pump.
SAFETY PRECAUTIONS
Model Nomenclature
Series:
RS = liquid to air split heat pump
Nominal Size:
45 = 030 compressor
55 = 040 compressor
65 = 051 compressor
75 = 060 compressor
80 = 072 compressor
Functions:
H = Heating
AC = Active Cooling
W = Domestic Hot Water
Refrigerant:
P = R410a
Voltage Code:
1 = 208/230-1-60 VAC
2 = 208-3-60 VAC
4 = 460-3-60VAC
5 = 575-3-60 VAC
6 = 220-1-50 VAC
7 = 380-3-50 VAC
Compressor:
S = 1 Stage Scroll
T = 2 Stage Scroll
Outdoor Loop Exchanger:
C = Copper
Y = CuNi coil & piping
Z = CuNi coil only
Revision:
01, 02 etc.
RS—65—HACW—P—1T—C—xx
AHH—65—P—1—SDESH—xx
Series:
AHH = horizontal refrigerant air handler
AHV = vertical refrigerant air handler
Nominal Size:
45 = for RS-45
55 = for RS-55
65 = for RS-65
75 = for RS-75
80 = for RS-80
Refrigerant:
P = R410a
Voltage Code:
1 = 208/230-1-60
3 = 265/277-1-60
6 = 220-1-50
Air Coil:
S = standard (non-coated)
K = e-coated
Blower Type:
D = direct drive
Blower Motor:
E = ECM (constant airflow)
Air Supply Orientation:
S = side
T = top
Cabinet Design:
H = horizontal
V = vertical
Revision:
01, 02 etc.
ISSUE 02: 26-Sep-2023 Page 3 002514MAN-03
APPLICATION TABLE: RS COMPRESSOR UNIT
SIZE FUNCTION REFRIGERANT VOLTAGE COMPRESSOR OUTDOOR
COIL REVISIONS
RS-45 HACW P
1
2
4
5
6
7
T
C
Y
Z
08
RS-55 HACW P
1
2
4
5
6
7
T
C
Y
Z
08
RS-65 HACW P
1
2
4
5
6
7
T
C
Y
Z
08
RS-75 HACW P
1 T
C
Y
Z
08
2 T
4 T
5 T
6 S
7 T
RS-80 HACW P
1
2
4
5
7
S
C
Y
Z
08
This manual applies only to the models and revisions listed in these tables.
Maritime Geothermal Ltd. has a continuous improvement policy and reserves the right to modify specification
data at any time without prior notice .
APPLICATION TABLE: AHH HORIZ. AIR HANDLER
SIZE REFR. VOLTAGE CONFIG. REVISIONS
AHH-45 P
1
3
6
SDESH 02
AHH-55 P
1
3
6
SDESH 02
AHH-65 P
1
3
6
SDESH 02
AHH-75 P
1
3
6
SDESH 02
AHH-80 P
1
3
6
SDESH 02
APPLICATION TABLE: AHV VERT. AIR HANDLER
SIZE REFR. VOLTAGE CONFIG. REVISIONS
AHH-45 P
1
3
6
SDESH 02
AHH-55 P
1
3
6
SDESH 02
AHH-65 P
1
3
6
SDESH 02
AHH-75 P
1
3
6
SDESH 02
AHH-80 P
1
3
6
SDESH 02
ISSUE 02: 26-Sep-2023 Page 4 002514MAN-03
Tables, Figures, & Documents ................................. 5
RS-Series System Description ................................. 6
General Overview ................................................................... 6
1. Heating Mode ..................................................................... 6
2. Cooling Mode ...................................................................... 6
Factory Options ...................................................................... 6
RS-Series Sizing ............................................................. 7
Heat Pump Sizing ................................................................... 7
Plenum Heater Sizing ............................................................. 7
Installation Basics ......................................................... 8
Sample Bill of Materials - Ground Loop Installations .............. 8
Sample Bill of Materials - Open Loop Installations .................. 8
Unpacking the unit .................................................................. 9
Unit Placement ....................................................................... 9
Air Outlet & Return Orientation ............................................... 9
Plenum Heater Installation (Optional) ..................................... 9
Wiring ................................................................................ 10
RS Compressor Unit Power Supply Connections ................. 10
AHH/AHV Air Handler Power Supply Connections ............... 10
Plenum Heater Power Supply Connections .......................... 10
Outdoor Loop Pump Module Wiring (Ground Loop Only) ..... 10
Control Transformer .............................................................. 10
Domestic Hot Water (Desuperheater) ................................... 10
Thermostat Connections ........................................................ 11
Compressor Unit/Air Handler Control Interconnection ........... 11
Plenum Heater Control Connections ..................................... 11
Air Handler Blower Motor ...................................................... 11
002515CDG - Typical RS-Series Wiring Connections .......... 12
Safety Controls ..................................................................... 13
Open/Closed Loop LPC Selection ........................................ 13
001901PDG - Wiring For Best Cooling Mode Dehum ............ 14
Piping ................................................................................ 15
RS Compressor Unit: Domestic Hot Water (Desuperheater) . 15
RS Compressor Unit: Outdoor Loop ..................................... 15
Air Handler: Condensate Drain ............................................. 15
002516PDG - Typical Piping/Duct Connections .................... 16
000970PDG - Desup. Connection to DHW Pre-Heat Tank .... 17
002384PDG - DHW Pre-Heat Tank - Multiple Units .............. 18
Refrigerant Connections ........................................... 19
Line Set Interconnect Tubing ................................................ 19
RS Compressor Unit Connections ........................................ 19
AHH/AHV Air Handler Connections ...................................... 19
Oil Traps ............................................................................... 19
Filter-Dryer ............................................................................ 19
Pipe Insulation ...................................................................... 20
Silver Soldering Line Sets ...................................................... 20
Pressure Testing .................................................................... 20
Vacuuming the System ......................................................... 20
Charging the System ............................................................ 20
Ductwork .......................................................................... 21
Blower Motor ......................................................................... 21
Duct Systems - General ........................................................ 21
Duct Systems - Grill Layout .................................................. 21
Thermostat Location ............................................................. 21
Plenum Heater ...................................................................... 21
Duct Sizing Guide ................................................................. 22
Ground Loop Installations .................................. 23
Circulator Pump Module ....................................................... 23
Flushing & Purging ............................................................... 23
Adding Antifreeze Solution .................................................... 24
Initial Pressurization .............................................................. 24
Pipe Insulation ...................................................................... 24
Table of Contents
000608INF - Typical Horiz. Ground Loop Configuration ........ 25
000609INF - Typical Vert. Ground Loop Configuration .......... 26
000906CDG - Circulator Pump Module Installation .............. 27
001823CDG - Dual Flow Pump Module Installation .............. 28
002336PDG - Pump Module Inst - 2 Units on 1 Loop ........... 29
Open Loop Installations ....................................... 30
Well Water Temperature ....................................................... 30
Well Water Flow .................................................................... 30
Well Water Quality ................................................................ 30
Water Discharge Methods .................................................... 30
Water Valve .......................................................................... 31
Water Flow Control ............................................................... 31
Submersible Pump Selection ................................................ 32
Stage 1 vs. 2 on Open Loop ................................................. 32
Plumbing the Heat Pump ...................................................... 32
Pipe Insulation ...................................................................... 32
000907CDG - Typical Open Loop Installation ....................... 33
001822CDG - Dual Flow Open Loop Installation .................. 34
000619INF - Ground Water Disposal Methods ..................... 35
Startup Procedure ....................................................... 36
Pre-start Inspection ............................................................... 36
Unit Startup ........................................................................... 37
Startup Record ...................................................................... 38
Routine Maintenance .................................................. 39
Maintenance Schedule ......................................................... 39
Troubleshooting Guide ............................................. 40
Repair Procedures ....................................................... 49
Pumpdown Procedure .......................................................... 49
General Repair Procedure .................................................... 49
Vacuuming & Charging Procedure ....................................... 49
Compressor Replacement Procedure ................................... 50
Model Specific Information ...................................... 51
Shipping Information ............................................................. 51
Refrigerant Charge ............................................................... 51
RS Compressor Unit Sound Levels ...................................... 51
Operating Temperature Limits ............................................... 51
Standard Capacity Ratings ................................................... 52
Pressure Drop Data .............................................................. 53
Performance Tables: RS-45 .................................................. 55
Performance Tables: RS-55 .................................................. 56
Performance Tables: RS-65 .................................................. 57
Performance Tables: RS-75 .................................................. 58
Performance Tables: RS-80 .................................................. 59
Airflow Data .......................................................................... 60
Electrical Specifications: RS Compressor Unit ...................... 61
Electrical Specifications: AHH/AHV Air Handler .................... 62
Electrical Specifications: Plenum Heater ............................... 62
Wiring Diagram: RS Compressor Unit (208/230-1-60) .......... 63
Electrical Box Layout: RS Compressor Unit (208/230-1-60) . 64
Wiring Diagram: AHH Horizontal Air Handler ........................ 65
Wiring Diagram: AHV Vertical Air Handler ............................ 65
Refrigeration Circuit - Heating Mode ..................................... 66
Refrigeration Circuit - Cooling Mode ..................................... 67
Dimensions: Model Size 45 .................................................. 68
Dimensions: Model Sizes 55/65/75/80 .................................. 70
Warranty ......................................................................... 72
ISSUE 02: 26-Sep-2023 Page 5 002514MAN-03
Tables, Figures, & Documents
Table 1 - Heat Pump Size vs. Heated Area for a Ground Loop System .................................................. 7
Table 2 - Heat Pump Size vs. Heated Area for an Open Loop System ................................................... 7
Table 3 - Plenum Heater Sizing ............................................................................................................... 7
Table 4 - Power Supply Connections (Compressor Unit) ...................................................................... 10
Table 5 - Power Supply Connections (Air Handler) ............................................................................... 10
Table 6 - Power Supply Connections (Plenum Heater) ......................................................................... 10
Table 7 - Ground Loop Circulator Connections ..................................................................................... 10
Table 8 - Thermostat Signal Connections ............................................................................................. 11
Table 9 - Control Interconnection .......................................................................................................... 11
Table 10 - Plenum Heater Control Connections .................................................................................... 11
Table 11 - Airflow Selections ................................................................................................................. 11
Table 12 - Control Board Fault Codes ................................................................................................... 13
Table 13 - Line Set Sizing ..................................................................................................................... 19
Table 14a - 3-way Service Valve Tooling .............................................................................................. 19
Table 14b - 3-way Service Valve Torques ............................................................................................. 19
Table 15 - Extra Charge for Model Size 45 ........................................................................................... 20
Table 16 - Extra Charge for Model Sizes 55-75 .................................................................................... 20
Table 17 - Heat Pump Size vs. Hot Air Grills ......................................................................................... 21
Table 18 - Duct Sizing Guide ................................................................................................................. 22
Table 19 - Antifreeze Percentages ........................................................................................................ 24
Table 20 - Volume of Fluid per 100ft. Of Pipe ....................................................................................... 24
Table 21 - Required Open Loop Flow .................................................................................................... 30
Table 22 - Shipping Information: RS Compressor Unit .......................................................................... 51
Table 23 - Shipping Information: Vertical Air Handlers ........................................................................... 51
Table 24 - Shipping Information: Horizontal Air Handlers ....................................................................... 51
Table 25 - Refrigerant Charge ............................................................................................................... 51
Table 26 - RS Compressor Unit Sound Levels ....................................................................................... 51
Table 27 - Operating Temperature Limits .............................................................................................. 51
Table 28 - Standard Capacity Ratings - Ground Loop Heating 60Hz .................................................... 52
Table 29 - Standard Capacity Ratings - Ground Water Heating 60Hz ................................................... 52
Table 30 - Standard Capacity Ratings - Ground Loop Cooling 60Hz .................................................... 52
Table 31 - Standard Capacity Ratings - Ground Water Cooling 60Hz ................................................... 52
Table 32 - Loop Pressure Drop Data ..................................................................................................... 53
Table 33 - MED Airflow (nominal) ........................................................................................................... 61
Table 34 - LOW Airflow (-6%) ................................................................................................................. 61
Table 35 - HIGH Airflow (+6%) ............................................................................................................... 61
Table 36 - MAX Airflow (+12%) .............................................................................................................. 61
Table 37 - Electrical Specifications: RS Compressor Unit ..................................................................... 62
Table 38 - Electrical Specifications: AHH/AHV Air Handler .................................................................... 63
Table 39 - Plenum Heater Electrical Specifications ............................................................................... 63
Figure 1 - Ground Loop Accessories & Tools ........................................................................................ 23
Figure 2 - Open Loop Accessories & Tools ........................................................................................... 31
002515CDG - Typical RS-Series Wiring Connections ........................................................................... 12
001901PDG - Wiring For Best Cooling Mode Dehumidification ............................................................ 14
002516PDG - Typical Piping/Duct Connections - RS Series ................................................................. 16
000970PDG - Desuperheater Connection to DHW Pre-Heat Tank ....................................................... 17
002384PDG - Desuperheater Connection to DHW Pre-Heat Tank - Multiple Units .............................. 18
000608INF - Typical Horizontal Ground Loop Configuration .................................................................. 25
000609INF - Typical Vertical Ground Loop Configuration ...................................................................... 26
000906CDG - Geo-Flo Circulator Pump Module Installation ................................................................. 27
001823CDG - Dual Flow Circulator Pump Module Installation for 2-Stage Heat Pumps ........................ 28
002336PDG - Circulator Pump Module Installation - Two Units on One Ground Loop........................... 29
000907CDG - Typical Ground Water (Open Loop) Installation ............................................................. 33
001822CDG - Dual Flow Groundwater (Open Loop) Installation for 2-Stage Heat Pumps ................... 34
000619INF - Ground Water Disposal Methods ...................................................................................... 35
001235SCH - RS-Series Schematic Diagram 208/230-1-60 ................................................................. 63
001236ELB - RS-Series Electrical Box Diagram 208/230-1-60 ............................................................. 64
001746SCH - AHH Schematic Diagram ................................................................................................. 65
001747SCH - AHV Schematic Diagram ................................................................................................. 65
001233RCD - RS-Series Refrigeration Circuit - Heating Mode ............................................................. 66
001234RCD - RS-Series Refrigeration Circuit - Cooling Mode ............................................................. 67
Tables
Figures
Documents
ISSUE 02: 26-Sep-2023 Page 6 002514MAN-03
RS-Series System Description
General Overview
The Nordic RS-series is a split water source heat pump
(with remote indoor air handler) that can heat or chill air in a
forced air duct system. As opposed to a package heat pump, a
split system provides the ability to locate the compressor unit
and air handler in different locations.
Being a ‘ground source’, ‘water source’, ’geoexchange’, or
‘geothermal’ heat pump, the RS-series does require either a
closed ground loop or open loop water well for a heat
source/sink. There is no outdoor fan unit for ground source heat
pumps.
In additional to the main space heating/cooling functions,
there is a double-wall desuperheater for pre-heating domestic
hot water with ~5% of the heat pump’s capacity. This function is
only active when the heat pump is running for space heating or
cooling purposes. An energy-efficient bronze head ECM circ
pump for the desuperheater circuit is built in, along with a tem-
perature control.
A two-stage scroll compressor with suction accumulator is
standard. The blower motor is a premium constant-airflow
ECM. The outdoor loop refrigerant to water heat exchanger is a
heavy duty coaxial copper / steel model, with optional CuNi in-
ner tube available for open loop applications. Thermostatic
expansion valves (TXVs) regulates superheat. The cabinets
are constructed from powder coated galvanized sheet metal.
1. Heating Mode
In heating mode, the system heats warm air in a duct sys-
tem. Heat is extracted from the ground loop or well water. The
heat pump is activated by a standard 3H/2C 24V room thermo-
stat, which will call for stage 1 or stage 2 heat according to its
own algorithm. The thermostat can also call for stage 3 (due to
air temperature falling further below the setpoint, or after a cer-
tain run time), which will activate the optional electric plenum
heater. The plenum heater accessory is available in different
sizes to provide either full backup or partial auxiliary heat.
If a closed ground loop is used, the circulation pumps are
powered and controlled by the heat pump; if open loop, a water
valve is opened by the heat pump during heating operation and
closed when the heat pump is idle.
2. Cooling Mode
In cooling mode, the system cools air in the duct system.
Heat is extracted from the ducted air stream and rejected to the
ground loop or well water.
Air Handler Options
There are two Nordic air handler configurations available,
horizontal (AHH) or vertical (AHV). Third party air handlers can
also be used with the Nordic RS compressor unit; in this case
caution should be used to select an air handler that has a large
enough refrigeration volume to provide good performance.
* See Piping chapter for an
annotated copy of this diagram
ISSUE 02: 26-Sep-2023 Page 7 002514MAN-03
RS-Series Sizing
TABLE 2 - Heat Pump Size vs. Heated Area
for an Open Loop System
Model ft2 m2
RS-45 1800 165
RS-55 2500 230
RS-65 3200 295
RS-75 3800 355
RS-80 4200 390
Heat Pump Sizing
The following table is a rough guideline as to the size of
space each heat pump size can handle for ground loop
(closed loop) installations.
The following table is a rough guideline as to the size of
home each heat pump size can handle for ground water (open
loop) installations.
THE TABLES ABOVE ARE FOR ESTIMATION ONLY.
THEY SHOULD NOT BE USED TO SELECT A FINAL UNIT
SIZE. They simply show what size unit is required for a north-
ern home with typical construction: R20 walls, R40 ceiling, and
average size and number of windows. The heated area is the
area of the above grade main level; the tables account for a
basement the same size as the heated area.
MARITME GEOTHERMAL LTD. HIGHLY RECOM-
MENDS THAT A PROPER HEAT LOSS/GAIN ANALYSIS BE
PERFORMED BY A PROFESSIONAL WITH APPROVED CSA
F-280 SOFTWARE BEFORE SELECTING THE HEAT PUMP
SIZE. For heating dominant climates, we recommend sizing
the unit to 100% of the heating design load for maximum
long term efficiency with minimal supplementary heat. The
unit should be installed as per CSA standard 448.2-02. For
ground loop applications, the ground loop should be de-
signed using suitable software with a multi-year analysis.
The analysis will result in a heat load for the coldest day,
which is influenced by, for example, the number of levels, the
size of the windows, the orientation of the home, attached gar-
age, bonus rooms, walk-in basement, and coldest outdoor tem-
perature for the region.
A heat pump model size can then be selected by compar-
ing the calculated heat load to the heat pump capacity at the
standard indoor air temperature, which can be found in the per-
formance tables in the Model Specific Information section.
For RS-series, the Standard Capacity Ratings rather than de-
tailed performance tables can be used for simplicity. For 100%
heat pump sizing, choose a heat pump with a standard capacity
rating that matches or just slightly exceeds the calculated heat
load.
Some background on Standard Capacity Ratings: closed
ground loops are normally designed to reach a minimum tem-
perature of just below freezing at the end of the heating season,
in order to take advantage of the latent heat of groundwater (at
least in northern climates). Hence, the Standard Capacity Rat-
ings for Ground Loop Heating should apply in all northern cli-
mates. Conversely, the Standard Capacity Ratings for Ground
Water (open loop) heat pumps assume a well water temperature
of 50°F (10° C). In more southerly climates, the groundwater or
ground loop will probably be at a warmer minimum temperature,
and it will be necessary to consult the more detailed perfor-
mance tables for heat pump output at a different ELT.
In cooling dominant climates, the heat pump should be
similarly sized using the Ground Loop Cooling or Ground Water
Cooling Standard Capacity Ratings. Even in northern heating
dominant climates, it should be ensured that 100% of the
cooling load will be covered when sizing the heat pump,
since there is normally no auxiliary or backup cooling avail-
able.
Plenum Heater Sizing
The plenum heater is available as an accessory in 5, 7, 10,
15 and 20kW sizes. If full backup is desired, choose a size that
covers 100% of the coldest day heat load, according to the
heat loss analysis mentioned in the last section. If that is not
available, use the following recommendation:
Two styles of plenum heater are available; the first is for
internal installation (inside the air handler). Note limit for size 45
in above table.
The second has a wider element profile for installation
outside the unit, in the ductwork.
TABLE 3 - Plenum Heater Sizing
Model
Plenum Heater Size (kW)
Full
Backup
Internally
Possible Not Internally
Possible
AHH/AHV-45 10 5, 7, 10 15, 20*
AHH/AHV-55 10 5, 7, 10, 15, 20
AHH/AHV-65 15 5, 7, 10, 15, 20
AHH/AHV-75 20 5, 7, 10, 15, 20
AHH/AHV-80 20 5, 7, 10, 15, 20
* Although these plenum heaters will not fit inside heat pump,
there are versions available for external mounting.
TABLE 1 - Heat Pump Size vs. Heated Area
for a Ground Loop System
Model ft2 m2
RS-45 1400 130
RS-55 2000 185
RS-65 2600 240
RS-75 3100 290
RS-80 3500 325
ISSUE 02: 26-Sep-2023 Page 8 002514MAN-03
Installation Basics
Sample Bill of Materials -
Ground Loop Installations
FROM MARITIME GEOTHERMAL
• RS SERIES COMPRESSOR UNIT
• AHH (HORIZ.) OR AHV (VERTICAL) AIR HANDLER
• PLENUM HEATER __kW
• THERMOSTAT (WIFI OR STD)
• P/T PORTS AND HOSE ADAPTERS (2)
• 1 OR 2 PUMP PACK
• PIPE ADAPTERS FOR PUMP PACK
OPTIONAL FROM MARITIME GEOTHERMAL
• ANTI-VIBRATION PAD FOR UNDER COMPR. UNIT
• SOUND JACKET
• SECURE START
• ELECTROSTATIC FILTER
DUCTWORK
• OUTLET PLENUM ADAPTER W/ FLEXIBLE COLLAR
• RETURN AIR ADAPTER W/ FLEXIBLE COLLAR
• FIBREGLASS INSULATION (FOR NOISE, IF REQ’D)
• TRUNK DUCT W/ JOINERS (IF NOT EXISTING)
• 6” ROUND DUCT W/ADAPTERS (IF NOT EXISTING)
• ALUMINUM TAPE
• SHEET METAL SCREWS
DHW
• PREHEAT TANK, 40 OR 60 GAL
• ½” COPPER PIPE
• ½” FITTINGS, BALL VALVES, BOILER DRAINS, CV
GROUND LOOP
• ¾” PE PIPE
• 1-1/4” PE PIPE
• PE PIPE FITTINGS
• 1” CLEAR HOSE (HEAT PUMP TO PUMP PACK)
• HOSE CLAMPS
• ANTIFREEZE: METHANOL OR PROP. GLYCOL
ELECTRICAL
• COMPRESSOR UNIT SERVICE WIRE: 6-3 OR 8-3
• AIR HANDLER SERVICE WIRE: 14-2
• PLENUM HEATER SERVICE WIRE
• HEAT PUMP BREAKER
• AIR HANDLER BREAKER
• PLENUM HEATER BREAKER
• THERMOSTAT WIRE 18-8 (THERMOSTAT TO RS)
• THERMOSTAT WIRE 18-5 (INTERCONNECTION RS-AH)
• THERMOSTAT WIRE 18-2 (RS-PLENUM HEATER)
• FORK TERMINALS FOR TSTAT WIRE (10)
• CONDENSATE PUMP & HOSE (IF REQUIRED)
REFRIGERATION
• 1/2” & 7/8” (OR 3/8” & 3/4”) ACR TUBING
• PIPE INSULATION
• EXTRA R410A REFRIGERANT FOR LINESETS >20 FT
• 2” STYROFOAM INSUL. (IF PAD NOT PURCHASED)
Sample Bill of Materials -
Open Loop Installations
FROM MARITIME GEOTHERMAL
• RS SERIES COMPRESSOR UNIT
• AHH (HORIZ.) OR AHV (VERTICAL) AIR HANDLER
• PLENUM HEATER __kW
• THERMOSTAT (WIFI OR STD)
• P/T PORTS AND HOSE ADAPTERS (2)
• DOLE VALVE
• MOTORIZED WATER VALVE
OPTIONAL FROM MARITIME GEOTHERMAL
• ANTI-VIBRATION PAD FOR UNDER COMPR. UNIT
• SOUND JACKET
• SECURE START
• ELECTROSTATIC FILTER
DUCTWORK
• OUTLET PLENUM ADAPTER W/ FLEXIBLE COLLAR
• RETURN AIR ADAPTER W/ FLEXIBLE COLLAR
• FIBREGLASS INSULATION (FOR NOISE, IF REQ’D)
• TRUNK DUCT W/ JOINERS (IF NOT EXISTING)
• 6” ROUND DUCT W/ ADAPTERS (IF NOT EXISTING)
• ALUMINUM TAPE
• SHEET METAL SCREWS
DHW
• PREHEAT TANK, 40 OR 60 GAL
• ½” COPPER PIPE
• ½” FITTINGS, BALL VALVES, BOILER DRAINS, CV
WATER SYSTEM
• 1” BLACK PLASTIC WATER PIPE
• 1” BARBED FITTINGS & HOSE CLAMPS
• VSP SUBMERSIBLE PUMP (IF NOT EXISTING)
• PRESSURE TANK (IF NOT EXISTING)
• CYCLE STOP VALVE (IF FIXED SPEED PUMP)
ELECTRICAL
• COMPRESSOR UNIT SERVICE WIRE: 6-3 OR 8-3
• AIR HANDLER SERVICE WIRE: 14-2
• PLENUM HEATER SERVICE WIRE
• HEAT PUMP BREAKER
• AIR HANDLER BREAKER
• PLENUM HEATER BREAKER
• THERMOSTAT WIRE 18-8 (THERMOSTAT TO RS)
• THERMOSTAT WIRE 18-5 (INTERCONNECTION RS-AH)
• THERMOSTAT WIRE 18-2 (RS-PLENUM HEATER)
• FORK TERMINALS FOR TSTAT WIRE (10)
• CONDENSATE PUMP & HOSE (IF REQUIRED)
REFRIGERATION
• 1/2” & 7/8” (OR 3/8” & 3/4”) ACR TUBING
• PIPE INSULATION
• EXTRA R410A REFRIGERANT FOR LINESETS >20 FT
• 2” STYROFOAM INSUL. (IF PAD NOT PURCHASED)
ISSUE 02: 26-Sep-2023 Page 9 002514MAN-03
Unpacking the Unit
When the RS compressor unit and air handler reach their
destination, they should be immediately unpacked to determine
if any damage has occurred during shiment. Any visible damage
should be noted on the carrier's freight bill and a suitable claim
filed at once.
The heat pump is well constructed and every effort has
been made to ensure that it will arrive intact, however it is in the
customer's best interest to examine the unit thoroughly when it
arrives.
Unit Placement
Ducted or forced air heat pumps should be centrally located
in the home with respect to the conditioned space. A heating
system cannot be expected to produce an even temperature
throughout the building when it is located at one end of the
structure and the heated or cooled air is transmitted with
uninsulated metal ductwork.
A split RS-series heat pump provides the flexibility of locat-
ing the air handler in the most central location for air ducting,
while locating the compressor unit in a mechanical room (noting
that that interconnecting line set cannot be more than 70 ft
long).
Compressor unit:
The front access panel where pipe connections are locat-
ed and right side access panel should remain clear of
obstruction for a distance of 2 ft (0.7 m) to facilitate servicing
and maintenance. No access is required on the back side.
Raising the compressor unit off the floor a few inches is
generally a good practice since this will prevent rusting of the
bottom panel of the unit and deaden vibrations. An anti-
vibration pad, available as an accessory, or a piece of 2”
styrofoam should be placed under the unit.
Air Handler:
The front access panel (with the fan motor behind it)
should remain clear of obstruction for a distance of 2 ft (0.7 m)
to facilitate servicing and general maintenance.
Ensure the unit is level to eliminate any possible conden-
sate draining issues. The vertical air handler has an air filter
rack which can be installed with the removable end (where the
filter is inserted) on either side to facilitate changing the filter.
The horizontal air handler has a filter rack on which any side can
be removed for air filter change. Be careful not to run piping in
front of the filter rack access cover, since access is required in
order to change the air filter.
Air Outlet & Return Orientation
On both the horizontal and vertical air handlers, the air
outlet and return locations are fixed and not field-changeable.
Therefore there are no factory options like right/left return. In-
stallation flexibility is provided by having the freedom to orient
the air handler separately from the compressor unit.
Looking at the side of the air handler where the refrigerant
pipes come out (the side that has the fan motor access panel),
air returns or flows into the unit from the back side. The back
side is where the filter rack is located.
On the AHH horizontal air handler, air is discharged to the
right. On the AHV vertical air handler, air is discharged upward.
Refer to the Dimensions section toward the end of this
manual for physical dimensions of the units.
Plenum Heater Installation (Optional)
The plenum heater is normally mounted into the air han-
dler cabinet. Remove the screws from the cover plate, remove
the cover plate, and place the plenum heater in the cutout.
Slide it toward the air outlet and secure the bottom flange with
three cover plate screws. For horizontal AHH model, use the
indicated knockouts on the air handler cabinet for electrical con-
nections.
When installation is complete, check the appropriate
box of the label on the unit door to indicate which size heat-
er was installed.
A plenum heater can also be installed in the air discharge
duct outside the heat pump cabinet in a manner that allows all of
the airflow to pass through it to prevent any hot spots in the
heater elements. There is an accessory plenum heater availa-
ble with a wider element cage for this application. Ensure that
the plenum heater is mounted in an approved position as per its
instructions.
ISSUE 02: 26-Sep-2023 Page 10 002514MAN-03
TABLE 4 - Power Supply Connections (Compr. Unit)
Line Description Voltages
L1 Line 1 All
L2 Line 2 All
L3 Line 3 3-phase only
N Neutral 208/230-1-60**, 208-3-60**,
380-3-50
** Neutral only required if connecting 115VAC circulators to the
heat pump for 208/230-1-60 and 208-3-60 models (the heat
pump itself does not require a neutral). Neutral is required for
380-3-50 models for desuperheater operation.
GND Ground All (connect to ground lug)
TABLE 6 - Power Supply Connections (Pl. Heater)
Line Description Voltages
L1 Line 1 All
L2 Line 2 All
GND Ground All (connect to ground lug)
L3 Line 3 3-phase only
Wiring
NOTE: A properly qualified electrician
should be retained for all connections to the
heat pump and associated controls. The
connections to the unit MUST CONFORM TO
LOCAL CODES.
NOTE: Three separate power supplies are required, for the
compressor unit and air handler and plenum heater. Each
must have its own supply wires and breaker.
RS Compressor Unit
Power Supply Connections
The compressor unit has a concentric 1.093” / 0.875”
knockout for main power supply connection from the breaker
panel to its electrical box. (There are also 0.875” knockouts and
a plastic grommet for control connections to thermostat, plenum
heater, air handler, and water valve; and power to ground loop
pump pack.)
A schematic diagram (SCH) and electrical box layout
diagram (ELB) can be found on the electrical box cover of the
unit as well as in the Model Specific Information section of this
manual. The Electrical Tables in the Model Specific Infor-
mation section contain information about the wire and breaker
IMPORTANT NOTE FOR 3-PHASE UNITS: If
on startup compressor is noisy and not
pumping, reverse L1 and L2 supply wires.
Outdoor Loop Pump Module Wiring
(Ground Loop Only)
The compressor unit has provision for connecting the cir-
culator pump module so that the pumps will be turned on when-
ever the compressor operates. Connect the circulator pump
module to the appropriate two terminals (115V or 230V) of the
terminal strip marked OUTDOOR CIRCULATORS, as per the
voltage of the circulator pump module. Ground wire should be
connected to the ground lug in the electrical box. Ensure that
the total current draw does not exceed the value indicated on
the label in the heat pump electrical box.
Control Transformers
The compressor unit and air handler each have their own
24vac class II control transformer. 208/230-1-60 and 208-3-60
models have a resettable breaker on the secondary side for
circuit protection. Should the breaker trip, locate and correct the
problem and then reset the breaker by pressing in on it.
All other voltage models have a transformer with primary
and secondary fuses for circuit protection.
TABLE 7 - Ground Loop Circulator Connections
Terminal Description
115V Connection for 115V circulator
115V
230V
230V
Use a 2-conductor 14ga cable.
Connection for 230V circulator
IMPORTANT NOTE: For 208/230VAC-1-60
units, if connecting to 208VAC power supply
move the red wire connected to the 240 ter-
minal of the transformer to the 208 terminal
of the transformer.
Domestic Hot Water (Desuperheater)
The desuperheater (located in the compressor unit) is pre-
wired and no field connections are necessary. There is a built-in
temperature switch to turn off the built-in DHW circulator when
the output temperature reaches 140°F (60°C), and on again
when the temperature falls to 120°F (49°C).
After the desuperheater is filled with water and purged of
air, activate the built-in DHW circulator by connecting the brown
wire with the blue insulated terminal to L1 of the compressor
contactor as shown on the wiring diagram in the Model Specific
Information section. Ensure the power is off when connect-
ing the wire. Also, turn on the DHW ON/OFF switch.
TABLE 5 - Power Supply Connections (Air Handler)
Line Description
L1 Line 1
L2 Line 2
GND Ground
Use a 2-conductor outdoor rated 14ga cable.
IMPORTANT NOTE: Local codes may require
a disconnect switch visible and/or reachable
from the air handler to be installed in the
power supply cable.
AHH/AHV Air Handler
Power Supply Connections
The air handler is powered from its own breaker. Note that
only single phase electrical service is available for the Nordic
AHH/AHV, so the advice of an electrician or alternate air han-
dling units should be sought for 3-phase installations.
Plenum Heater
Power Supply Connections
The plenum heater is powered from its own breaker.
ISSUE 02: 26-Sep-2023 Page 11 002514MAN-03
Thermostat Connections
The air/room thermostat is connected to the compressor
unit, which in turn acts as a master to the air handler.
A three-stage heating and two stage cooling heat pump
configurable thermostat is required for two-stage models. The
stages are S1 = Stage 1 compressor, S2 = Stage 2 compressor
and S3 = electric auxiliary (heating only). One can be pur-
chased with the unit, or other heat pump thermostats with the
same number of stages can be used. Refer to diagram on a
following page for connections between the thermostat and the
heat pump.
NOTE: A very few models are not available in two-stage. Model
numbers with a T in the Compressor designator are two-stage;
models with an S are single stage (verify the model number
against pages 2 and 3 of this manual, or refer to the Electrical
Specifications near the end of this manual to determine if the
model is two stage or one stage). The Y2 signal is not used for
these units, and they only require a 2 stage heat 1 stage cool
Air Handler Blower Motor
The Nordic AHH/AHV air handler is equipped with a direct
drive ECM fan motor for maximum efficiency. The motor fea-
tures a soft start which provides a smooth, quiet ramp up to op-
erating speed . The motor will maintain the programmed air flow
up to the maximum external static value.
The air flow can be set to four different levels by manually
changing the wire position on the tap board located in the air
handler’s electrical box. The four levels are indicated in the
below table. Refer also to the airflow tables in the Model Spe-
cific Information section. Units are shipped with the MED posi-
tion selected for nominal air flow.
The air flow can be further reduced by 15% by making a
dry contact across AR1 and AR2 on the air handler’s terminal
strip. This can be used by a zone controller or other external
relay for applications that have multiple zones, or retrofits with
undersized ductwork to help reduce air flow noise. It is recom-
mended that airflow reduction only be used with the HIGH or
MAX air flow setting. Care should be taken to ensure that the
unit does not trip a safety control in heating or cooling mode if
the 15% reduction is used in conjunction with the MED or LOW
air flow setting.
TABLE 8 - Thermostat Signal Connections
Signal Description
C 24VAC Common (Ground)
G Fan low speed (for air recirculation)
Y1 Heat Pump Stage 1
RH 24VAC Hot
L Fault (24VAC when fault condition)
W2 Heat Pump Stage 3 (auxiliary heat) /
Emergency Heat
O Cooling Mode (reversing valve)
Y2 Heat Pump Stage 2 (not used for single stage
units)
Use an 18-8 thermostat cable.
TABLE 11 - Airflow Selections
Position Airflow
LOW -6%
MED Nominal
HIGH +6%
MAX +12%
TABLE 10 - Plenum Heater Control Connections
Signal Description
I 24VAC from plenum heater
(Connect to C or I in plenum heater)
1 24VAC back to plenum heater for ON command
(Connect to 1 and 2 in plenum heater)
Compressor Unit / Air Handler
Control Interconnection
The RS compressor unit receives commands from the air/
room thermostat and controls the air handler accordingly. Five
control wires must be installed between the units for this pur-
pose. These are all dry contact connections, meaning the con-
trol transformers in the RS unit and the air handler remain isolat-
ed from each other.
TABLE 9 - Control Interconnection
Signal Description
FR 24VAC from air handler
FG
24VAC back to AH for fan low speed / recirc.
(If using a third party air handler with a single speed
fan, connect FR and FG only.)
FY1 24VAC back to AH for stage 1 fan speed
FY2 24VAC back to AH for stage 2 fan speed
FW2 24VAC back to AH for stage 3 / aux. fan speed
Use an 18-5 thermostat cable.
Plenum Heater Control Connections
The plenum heater is activated in a similar way by the
compressor unit: when the compressor unit receives a stage 3
heating demand on W2 from the thermostat, it controls the ple-
num heat accordingly. Two control wires must be installed be-
tween the units for this purpose. These are all dry contact con-
nections, meaning the control transformers in the RS unit and
the plenum heater remain isolated from each other.
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Safety Controls
The heat pump has two important built in safety controls
which are designed to protect the unit from situations which
could damage it should the operation of the refrigeration circuit
fall outside the allowable operating range.
1. High Pressure Control
The high pressure safety control monitors the compressor
discharge pressure and will shut the compressor down if the
condensing pressure becomes too high.
There are (3) main reasons this control would activate in
response to the operating conditions of the unit while operating
in heating mode:
1. Low or no airflow.
2. High air temperature (unlikely).
3. Plugged air filter, or dirty air coil.
4. High refrigerant charge after service, or mechanical
malfunction (see Troubleshooting section).
2. Low Pressure Control
The low pressure control monitors the compressor suction
pressure and will shut the compressor down if the refrigerant
evaporating pressure becomes too low, risking the danger of
freezing conditions in the evaporator.
There are (3) main reasons this control would activate in
response to the operating conditions of the unit while operating
in heating mode:
1. Low or no outdoor loop flow.
2. Low outdoor loop entering liquid temperature.
3. Dirty or fouled outdoor loop heat exchanger.
4. Low refrigerant charge due to leak, or mechanical mal-
function (see Troubleshooting section).
The unit contains a control board that monitors the safety
controls and operates the compressor accordingly. The low
pressure control and high pressure controls are connected to
the control board as shown on the wiring diagram later in this
manual.
The compressor will not be allowed to start if a ‘fault’ con-
dition exists. A ‘fault’ occurs if either one of the pressure con-
trols exhibits an open circuit. In addition, the board monitors the
voltage of the 24vac transformer. A fault will occur if a low volt-
age condition (electricity grid brownout) is detected.
The control board has an on-board LED and an ALR pin
with a 24VAC output, which is routed to the L terminal of the
thermostat terminal strip. An external indicator or relay can be
connected across L and C on the terminal strip if external signal-
ing is desired. Should a fault condition occur, the LED will flash
the code of the fault condition. The codes are shown in the fol-
lowing table. The control board will lock out the compressor for
five minutes when a fault occurs. The control board will then
restart the compressor if the fault has been cleared. Should a
second fault condition occur within a 60 minute period the con-
trol board will go into permanent lockout mode and energize the
ALR pin. The LED will flash the fault code until the control
board is reset by powering down the unit.
The board has a TEST jumper, which defeats the 5 minute
anti-short cycle timer for test purposes. If left in the TEST posi-
tion, it will time out and return to normal operation after a set
time period. This is to prevent compressor short cycling and
possible damage or shortened lifespan if the jumper is acci-
dentally left in the TEST position.
There are also FREEZE TEMP and WATER TEMP jump-
ers on the control board. These are not used and have no
effect on heat pump operation.
Open/Closed Loop LPC Selection
There are two low pressure safety controls in the heat
pump: 75 psi for open loop (water), and 55 psi for closed loop
(antifreeze). As shipped, the closed loop LPC will be active.
If an open loop is used, it is very important to remove
the jumper plug located in the wiring harness behind the
piping post, and replace it with the water valve connection
harness that comes with the water valve from Maritime Geo-
thermal. This will automatically select the higher LPC, and en-
sure that the heat pump is properly protected from freezing. It
will also ensure the water valve is open before starting the com-
pressor.
See wiring diagram in the Model Specific Information
section for water valve wiring.
TABLE 9 - Control Board Fault Codes
Fault LED Flashes
High Pressure 1
Low Pressure 2
Brownout 5
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Piping
RS Compressor Unit: Outdoor Loop
The connections for the Outdoor Loop circuit are 1”
brass female NPT. They are labelled OUTDOOR IN and
OUTDOOR OUT.
See the following chapters for details on ground loop and
open loop installations.
RS Compressor Unit:
Domestic Hot Water (Desuperheater)
The connections for the DHW circuit are 1/2” brass
FPT fittings. They are marked DHW IN and DHW OUT.
A typical piping diagram for a pre-heat tank configuration
can be found in document 000970PDG at the end of this sec-
tion. Be sure to note the position of the check valve and the
direction of water flow. Other configurations are possible, and
there may be multiple units tied together in larger buildings.
Ensure the tank is filled with water and under pressure
before activating the built-in DHW circulator as described below.
First, slightly loosen the boiler drain on the DHW Out pipe to
allow air to escape from the system. This step will make certain
that the domestic hot water circulator in the unit is flooded with
water when it is started.
Activate the built-in DHW circulator by connecting the
brown wire with the blue insulated terminal to L1 of the com-
pressor contactor. Ensure the power is off when connecting
the wire. Once connected the DHW switch on the front of the
unit may be used to enable/disable the domestic hot water circu-
lator.
The DHW loop may have to be purged of air several times
before good circulation is obtained. A temperature difference
between the DHW In and DHW Out can be felt by hand when
the circulator pump is operating properly.
For the pre-heat tank setup, the final tank should be set to
140°F (60°C), which is required by most codes. The pre-heat
tank does not require electric elements. This setup takes full
advantage of the desuperheater as it is the sole heat provider to
the pre-heat tank. The desuperheater remains active during the
compressor runtime until the pre-heat tank has been completely
heated by the desuperheater alone. This setup is more energy
efficient than a single tank setup, and eliminates the possibility
of reverse heating of the refrigerant gas under low condensing
temperature operating conditions.
WARNING: USE ONLY COPPER LINES TO
CONNECT THE DESUPERHEATER. TEMPERA-
TURES CAN BE >200°F NEAR THE UNIT WITH
DESUPERHEATER TURNED OFF, POTENTIALLY
MELTING & RUPTURING PLASTIC PIPING.
CAUTION: the domestic hot water pump is
water lubricated; damage will occur to the pump
if it is run dry for even a short period of time.
CAUTION: If two (2) shut-off valves are located
on the domestic hot water ines as shown in the
diagram, a pressure relief valve must be in-
stalled to prevent possible damage to the do-
mestic hot water circulator pump should both
valves be closed.
Air Handler: Condensate Drain
The air handler comes equipped with one 3/4” female PVC
socket drain connection. This drain allows the condensate
which forms during the air conditioning cycle to be removed
from the unit. The drain should be connected and vented as per
local codes. During high humidity weather, there could be as
much as 25 gallons of water formed per day.
The condensate drain is not internally trapped and re-
quires an external trap. An external condensate pump may be
installed if there is not sufficient slope to drain condensate under
gravity to its destination.
To avoid overflow of the condensate pan, the drain line
and trap should be inspected periodically to ensure they are not
plugged with accumulated debris. There may be an alarm for
condensate overflow, which will disable unit operation.
Note that connection and use of the desuperheater is op-
tional, and there is no problem for the heat pump if desuperheat-
er is left unconnected.
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ISSUE 02: 26-Sep-2023 Page 19 002514MAN-03
Refrigerant Connections
AHH/AHV Air Handler Connections
The air handler unit has capped off (soldered) pipes from
the factory and is charged with 15 - 25 psig of nitrogen. Cut off
the end of the pipe and braze onto line set tubing, using a
coupling. See diagram in Piping chapter for a typical
installation.
Oil Traps
If the line set has a vertical rise of over 20 ft (6 m), then
an oil trap must be placed in the line set every 20 ft (6 m) of rise.
Filter-Dryer
Note that no field installed filter-dryer is required, since
one is included in the RS compressor unit.
TABLE 14a - 3-way Service Valve Tooling
Nominal
Size
Hex key to
open/
close
Valve cap
wrench
Charging
port cap
wrench
3/8” 5 mm
(3/16”)
19 mm
(3/4”)
14 mm
(9/16”)
1/2” 5 mm
(3/16”)
19 mm
(3/4”)
14 mm
(9/16”)
3/4” 5 mm
(3/16”)
30 mm
(1-1/4”)
14 mm
(9/16”)
7/8” 8 mm
(5/16”)
42 mm
(1-3/4”)
14 mm
(9/16”)
Line set
connection
nut wrench
22 mm
(7/8”)
24 mm
(1”)
32 mm
(1-3/8”)
38 mm
(1-1/2”)
Line Set Interconnect Tubing
Once both the RS compressor unit and AHH/AHV air
handler have been mounted, the line set may be run between
them. The line set consists of a liquid line and a vapour line.
The tubing used for this procedure must be ACR
refrigeration tubing (cleaned & dehydrated). Every effort must
be made to insure that the tubing does not become
contaminated during installation. It is recommended that caps
be placed on the open ends of tubing immediately after cuts are
made and that these caps are only removed after all bends have
been made and the pipe fixed in its permanent location ready to
make the silver soldered joints. It is very important to keep a
refrigeration system perfectly clean and dry. Removing the caps
just prior to silver soldering or flaring will ensure minimum
exposure to humidity in the atmosphere.
IMPORTANT NOTE: The line set between the
compressor unit and air handler must not ex-
ceed 70 ft. (21 m) in length.
TABLE 13 - Line Set Sizing
RS-45 Vapour line O.D. 3/4”
Liquid line O.D. 3/8”
Vapour line O.D. 7/8”
Liquid line O.D. 1/2”
RS-55/65/75/80
RS Compressor Unit Connections
The connections for the interconnect line set are 3-way
brass service valves with flare connections. After the line set is
installed, the tubing can be vacuumed through the Schrader
charging port on the 3-way valve, then the valve opened to let
refrigerant contained in the compressor unit into the line set and
air handler.
The RS compressor unit comes pre-charged with
enough refrigerant for a 20 ft (6.1 m) line set. Longer line sets
will require added charge; see next page.
Copper flare to solder adapters are included with the
RS compressor unit, to remove the requirement to do an
accurate flare in the field, especially on the larger 7/8” pipe.
These are placed near the compressor or in the electrical box.
line set
connection
nut
valve cap
(hex key to
open/close
underneath)
charging
port
TABLE 14b - 3-way Service Valve Torques
Nominal
Size
Line set
connection
nut torque
Valve cap
torque
Charging
port cap
torque
3/8” 30-35 N.m
(22-26 ft.lb)
20-25 N.m
(15-18 ft.lb)
10-12 N.m
(7-9 ft.lb)
1/2” 40-45 N.m
(30-33 ft.lb)
25-30 N.m
(18-22 ft.lb)
10-12 N.m
(7-9 ft.lb)
3/4” 60-65 N.m
(44-48 ft.lb)
35-40 N.m
(26-29 ft.lb)
10-12 N.m
(7-9 ft.lb)
7/8”
110-120
N.m (81-88
ft.lb)
47-53 N.m
(35-39 ft.lb)
10-12 N.m
(7-9 ft.lb)
Hex key
torque
5-7 N.m
(4-5 ft.lb)
7-9 N.m
(5-7 ft.lb)
11-13 N.m
(8-10 ft.lb)
28-32 N.m
(21-24
ft.lb)
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TABLE 15 - Extra Charge
for Model Size 45
Extra
charge
for line
sets
>20 ft
(6 m)
1.1 oz per ft
OR
0.10 kg per m
Line set
length
(ft)
Extra Charge
(oz) (lb) (kg)
22 2 0.1 0.06
24 4 0.3 0.12
26 7 0.4 0.19
28 9 0.6 0.25
30 11 0.7 0.31
32 13 0.8 0.37
34 15 1.0 0.44
36 18 1.1 0.50
38 20 1.2 0.56
40 22 1.4 0.62
42 24 1.5 0.69
44 26 1.7 0.75
46 29 1.8 0.81
48 31 1.9 0.87
50 33 2.1 0.94
52 35 2.2 1.00
54 37 2.3 1.06
56 40 2.5 1.12
58 42 2.6 1.19
60 44 2.8 1.25
62 46 2.9 1.31
64 48 3.0 1.37
66 51 3.2 1.43
68 53 3.3 1.50
70 55 3.4 1.56
Charging the System
The RS compressor unit is pre-charged for line sets up to
20 ft long. Once the system has been vacuumed, if extra
refrigerant is required due to the length of the line set, it may be
added before opening the access valves. Close off the charge
valve on the refrigeration manifold set and disconnect the
vacuum pump. Connect the charge (yellow) hose to the liquid
port of a refrigerant tank and place the tank on a scale. Open
the liquid valve of the refrigerant tank and then slightly loosen
the charge (yellow) hose at the manifold until liquid comes out,
then quickly re-tighten the hose. This will ensure that no air
enters the system. Zero the scale and then add the amount of
refrigerant calculated from the tables below.
Once the additional charge (if any) has been added,
disconnect both hoses from the service ports of the access
valves and place the caps back on them, tighten with a wrench.
Remove the caps from the access valves and open both
valves with a hex key. Open the valves (counter-clockwise) until
they stop turning. Replace the caps and tighten with a wrench.
TABLE 16 - Extra Charge
for Model Sizes 55-
80
Extra
charge
for line
sets
>20 ft
(6 m)
Line set
length
(ft)
Extra Charge
(oz) (lb) (kg)
22 4 0.3 0.12
24 8 0.5 0.24
26 13 0.8 0.36
28 17 1.1 0.48
30 21 1.3 0.60
32 25 1.6 0.71
34 29 1.8 0.83
36 34 2.1 0.95
38 38 2.4 1.07
40 42 2.6 1.19
42 46 2.9 1.31
44 50 3.2 1.43
46 55 3.4 1.55
48 59 3.7 1.67
50 63 3.9 1.79
52 67 4.2 1.91
54 71 4.5 2.02
56 76 4.7 2.14
58 80 5.0 2.26
60 84 5.3 2.38
62 88 5.5 2.50
64 92 5.8 2.62
66 97 6.0 2.74
68 101 6.3 2.86
70 105 6.6 2.98
2.1 oz per ft
OR
0.18 kg per m
Pipe Insulation
All line set refrigerant piping between the two units should
be insulated with 3/8” thick closed cell pipe insulation to prevent
condensation and dripping onto floors or walls during the
heating season. It can be slid onto the capped tubing without
having to slice it down the side for the most part. Ensure that
any joints in in the line sets are accessible for leak testing.
Liquid and vapour ports and any remaining exposed tubing
should be insulated with 3/8” thick closed cell pipe insulation
once the silver soldering and pressure testing is complete.
Ensure that all individual pieces of pipe insulation are glued to
each other so there are no air gaps.
Silver Soldering Line Sets
All joints are to be silver soldered with 5% silver solder. It
is absolutely required that dry nitrogen be bled through the
system during all silver soldering procedures so that no
oxidation occurs on the inside of the copper tubing.
Connect a set of refrigeration gauges to the service ports
(Schrader ports) on the access valves of the RS compressor
unit, the low side (blue hose) to the vapour line and the high
side (red hose) to the liquid line. Connect the charge line
(yellow hose) to a nitrogen source. Disconnect the high side
(red) hose at the manifold so that nitrogen may flow freely
though the line set. Adjust the nitrogen pressure through the low
side (blue hose) so that it can be very lightly felt when a finger is
placed on the disconnected high side (red) hose.
A wet rag may be wrapped around each of the air handler
pipes to prevent melting the grommet when silver soldering;
however this may not be necessary for a skilled welder due to
the distance from the grommet. Ensure that no water enters
any of the ports or tubing.
Pressure Testing
Once all connections are complete, the system should be
pressure tested to a final test pressure of 125 psig (860 kPa)
with dry nitrogen. Reconnect the high side (red) hose to the
manifold and pressurize the line set. It is recommended to
pressure test in stages, listening and inspecting for leaks along
the way. For example, 10 psig (70 kPa) , 25 psig (170kPa), 75
psig (520kPa) and then finally 125PSIG (860kPa). Check all
joints at the unit and any made in the interconnect tubing for
leaks using soap suds, Spray Nine, etc. It is important not to
bypass this step as vacuuming the system with a leak will be
impossible and attempting to do so will introduce moisture into
the system, making the vacuum process take much longer than
if the leak had been found and repaired first. It is recommended
that the system be left under pressure for a minimum of two
hours to ensure there are no small leaks that were undetected.
Vacuuming the System
Remove the pressure from the system and connect the
vacuum pump to the charge line (yellow hose) of the
refrigeration manifold. Tighten all hose connections, open the
valves on the manifold and start the vacuum pump.
Vacuum the system until the reading on an electronic
vacuum gauge remains below 500 microns for a period of 5
minutes after the vacuum pump is shut off and the system
sealed.
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